code: def main():
      """Create calibration coefficient files for AVHRR."""
      out_dir = sys.argv[1]
      coeffs = get_all_coeffs()
      save_coeffs(coeffs, out_dir=out_dir)
  
file_path: satpy/utils/fetch_avhrr_calcoeffs.py
imports: import datetime
  import os.path
  import sys
  import h5py
  import urllib2
label_desc: Use image node_id 5 for calling a global function with example usage: main() without return types